Heinrich messing



(Re Modl.) I

.H. MES'SING. MOLD FOR-CASTING HOLLOW A RTIGLES.

No. 570,324. PatentdOcti 27, 1896.

UNITED STATES PATENT OFFICE.

HEINRICH MESSING, OF OFFENBACII, GERMANY.

MOLD FOR CASTING HOLLOW ARTICLES.

SPECIFICATION forming part'of Letters Patent No. 570,324, dated October27, 1896..

Application filed June 8, 1895- Serial No. 552,096. (No model.) Patentedin France A ril '22, 1895, No. 246,804, and in Germany August 19,1895,1l'o.83,385.

To all whom it may concern.-

Be it known that I, I-Innvnrcn Mnssnvo, a subject of the Emperor ofGermany, and a resident of Offenbach, near Frankfort-on-the- Main,Germany, have invented certain new and useful Improvements in Casting,(patented in GermanyAugust 19, 1895, No. 83,385, and in France April 22,1895, No. 246,804,) of which the following is a specification.

This invention relates to the manufacture of hollow thin castings.

The usual process adopted in producing hollow castings without theassistance of a core, known as the instantaneous overturning process, iscarried out (as is well known) by pouring the metal or material to formthe casting into the mold and then overturning the mold so that itsinlet-orifice or gate is downward, the said mold being at the same timeShaken, whereupon the inner fluid portion of the cast metal or materal(as it has not then solidified) issues from the said inletorifice orgate and consequently leaves a space in the interior of the casting. Thedisadvantage of this method is that in order to allow this issue of thecast metal or material it is necessary to provide a very wide orifice orgate in the mold, as otherwise the metal or material would not be ableto pass the current of inflowing air, and in all cases the inflow of airby the same orifice as that by which the metal ormaterial is to issueoffers a serious impediment to the outflow of the metal or material. Ithas also been found that while the metal or material is escaping fromthe mold the external air has a tendency to force its way through thepoints connecting the sections of which the mold is composed, therebyoccasioning the formation of bubbles and flaws in the casting. Owing tothese drawbacks hitherto as much as sixty per cent. of metal or materialhas been wasted in the performance of this process.

The object of this invention is toovercome these objections. Accordingto this invention air is, during the overturning process, caused to passinto the interior of the casting at one part or at more than one partthereof, thereby equalizing the pressure between the interior of thesaid casting and the external atmosphere. This can be effected byarranging at any convenient point of the mold, say opposite thecasting-orifiee .or gate, a port or channel commencing at the outside ofthe mold and extending as far as is practicable inward, this port orchannel beingkept closed during the casting operation, but being openedas soon as overturning is proceeded With. When open, it affords freeaccess of air to the interior of the cast liquid metal or materialwithout encountering any impediment or obstruction, and as no differenceof pressure between the interior of the casting and the outer atmospherethen exists there is nothing to cause any tendency on the part of theexternal air to penetrate the walls of the mold at the joints and toform bubbles within it, so

that a faultless and flawless thin casting is obtained.

For the purposes of this invention a small tubeof steel, brass, &c., maybe embedded in grooves facing each other and formed one in each of thetwo sections or parts of the mold. This tube extends into the interiorof the mold and is closed by means of a wire or any other suitable plug.hen overturning is performed, the wire or plug is removed to open thetube for air to pass through.

Inthe case of comparatively large castings any suitable number of suchtubes or chan nels leading to the interior of the mold may be provided.I

This invention offers the further advantage that very thin-walledcastings can be produced, because metal can flow out very rapidly anddoes not remain at rest long enough to solidify in too thick a layer,and therefore a considerable economy in metal is effected.

The accompanying drawing shows the interior face of one section of amold arranged according to my invention, 0t being a section of the moldprovided with a gate (1?, b the tube leading into the interior of themold, and c the wire or plug which closes temporarily the tube 1), butwhich is withdrawn when the mold is overturned. At convenient places theface of the section ais provided with the usual lugs d, which engagecorresponding recesses in the opposing face of the other section,thereby insuring the proper alinement of the sections when broughttogether.

In operation the mold is turned to bring the mouth of the gate upward,and after the wire 0 or whatever other means is employed is adjusted toclose the airport the molten metal is poured into the gate and entersthe mold. That portion of the metal which comes into contact with thesides of the mold hardens more rapidly than the remainder, and after thehardened metal reaches the required thickness the mold is overturned,that is, the mouth of the gate is turned downward, allowing all thatportion of the metal in the mold which is in a molten state to run outthrough the gate. Simultaneously with the overturning of the mold theair-port is opened, and as the metal runs out of the mold its place istaken by air which enters through said port.

I claim- 1. A mold for casting hollow bodies provided with a gate andwith one or more airchannels extending from the exterior of the 20HEINRICH MESSING. Vitnesses:

FRANZ I-IAPLAOHER, ADOLPH SOHIELE.

